cmake HAS_FUTIMENS examples

WebAssembly/wasm-jit-prototype Lib/Platform/CMakeLists.txt :68 

check_symbol_exists(futimens sys/stat.h HAS_FUTIMENS)

WebAssembly/wasm-jit-prototype Lib/Platform/CMakeLists.txt :70 

list(APPEND PLATFORM_PRIVATE_DEFINITIONS "HAS_FUTIMENS")